Hemorrhage is a bleeding disorder, and there are three clinical causes of bleeding disorders. The first, vascular causes. Patients with vitamin C deficiency are prone to hemorrhage due to increased permeability and decreased density of the blood vessels. One of these conditions is called congenital capillary dilation, which can also present with hemorrhage. The second, platelet causes. If the number of platelets is severely reduced or dysfunctional, poor coagulation function, will also appear more than one blood flow, often after the supplementation of platelets, can achieve the effect of hemostasis. The third, coagulation disorders, such as hemophilia A caused by coagulation factor 8 deficiency and hemophilia B caused by coagulation factor 9 deficiency, can cause bleeding after trauma. Hemophilia is a hereditary disease, and severe cases often present with hemorrhage since childhood, posing a great threat to human health.